exam Maths Puzzle Numerical Ability

4x-(x+14)=4x+3

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PLEASE I NEED HELP ON THIS PROBLEMS: (3X^2-6)^2=

X^4-16=

(X+7)(X+9)=

X^2+14X+33= 1. (Age) a father is now three times as old as his son. Twelve years ago he was six times as old as his son. Find the present age of each.